Rotary cement-kiln.



No. 315,705; I PATENTBD'MAR. 20 H. HITZEL.

ROTARY CEMENT KILN. APPLICATION FILED OUT- 31. 1904.

L T E E H Haw 7y er QM a SHEETS-SHEET 2.

. Q MW N WT MN mm .Q w.

H HITZEL ROTARY'GBMENT KILN. APPLIOATION 111131001231. 190g.

' mus/Iron: f/m

ATTORNEY.

WITNESSES n; all whom/it i'nay concern.-

HARRY 'HIITZEL, or ALPHAINEW JERSEY, 'AssIeNo TO-ALPH-A PORTLAND CEMENTCOMPANY, or ALPHA, NEW. JERSEY, coRroRArIoN on NEW JERSEY. 3

R TARYcEMENj-I- ILN.

Be it known that I, HARRY Hnrz-EL, a citi zen of the United States,residing at v Alplha in the county of Warren and State of cut Jersey,have invented certain new and useful,

' Im rovements'in' Rotary Cement-Kilns, of

I description, reference being had to the accom- "IOonashaft whlch thefollowingis a full, clear, and exact.

, panying drawings, of which Figure 1 1s a side elevation,partlyinsection, of an apparatus for burning cement hav- 'ing myinvention embodied therein. Fig. 2

Isa lan view. Fig. 3-is an end elevation of ,the In or furnacelooking'at the hood end thereof. Fig; 4 is afull section online a a,

Fig 1. H his. invention relates more especially to apparatus forinjecting finely p ulverized car ibonaceous fuel'mto rotary cement-kilnsbymeans of a current of air; and its object is'to economize the .cost ofburniii the cement by injecting the'fuel mt'ofthe k1 hot air. with.which the-fuel is commingled in a suitable blower used to force the hot.air and by means of fuel into the kiln.

To this end the inventionconsists in the combination, with the kiln, ofa rotary blower,

' aninlet-pipe leading from a, source ofsupply l ed out.

of hot 'air mto the blower,"mea ns for feedmg .30

into the latter a uniform uantity of carbonafceousfuel in finelyow eredform, and an outlet-pipe from sai blower for the hot air and fuel, whichpi e leads into the kiln.

' The invention urther consists of,,certain details of construction andcombinations hereinafter. described and particularly point- Referringnow tothe accorn ang ing drawings, which illustratea articu ar inventionwhich I have ound to operate very successfully in actual practice, '1-isa rotary kiln or furnace, the lower end portion from which the calcinedclinker escapes only being shown. a 2 is the stationary (thatis,non-rotatable) hood adjacent to the end of the kiln and usually builtupof suitable brick. f 3, i'st'he pit,

usually termed the clinker-pit, into which the hot cement-clinker fallsas it leavesthe kiln. I make this hood with a chamber i, that preferablycommunicates by a vertical pas I Specification of Letters Patent;Application filed' October 1, 1904. Seria1Nd2li0fl'I4- orm of the -ofthe kiln.

mated Mach 20,1906

WhlOh passage-way hot air from the clinkerpit enters the chamber 4.

"6, Figs. 1 and 2, is an. ordinary rotary sage-way 5 with theclinker-pit, through" blower, driven from a suitable source of ower. Inthis instance said blower is driven om a shaft .7 through abelt 8passing around a pulley 9 on said "shaft, and around a ulle 1 1 is ashaft aralle wit shaft 10, on which is a tight pulley 12, (also a loosepulley 12%,) around which passes a, belt 13, which also passes around a"on the shaft 15 of the blower. and 11 are connected by a well-knowndevice A (indicated by dotted lines in Fig. 2) for var ulley 14 The safts. -10

rying the speed of the shaft 11, and consequently that of the-blower, orany known -means may be employedfor changing the peed of rotation of theblower-shaft, as may berequired' l Leadin from the interior-of thebeforementione chamber. 4' into thev central tion (that is, the suctionpart) of the blower is apps 16, and from the peripheral partof. thelower-casing (that is, the pressure part) pora pipe 17- leads through anopening 17 throughthehood 2,-into the kiln'l. This me, which, however,may bQ'COIlOIltIiC with the kiln, is preferably, as shown, directed ashort distance to one side and below the axis of the kiln, so as todirect the flame against the material within the kiln. Also leading intothe round a cone-pulley 24 onfashaft 25, having 'a a bevel-gear 26, thatengages a bevel-gear 27 on the shaft 28 of the conveyer 21.

30, Figs.3 and 4, denotes the usual eephole p times omitted.

" Having described the construction of my invention, I now proceeddescribe the opin the-hood for observing the interi'or i ThlS hole isg-jjhowever, some heated air isdrawn into the hood-chamber 4 by way ofassage 5 and by the suction inducedby t e blower through the pipe 16into the blower, while at the same time a continuous uniform quantity ofthe finely-dis vided fuel from the hopper is fed forward in pi e 18 bythe screw conveyer and descen s into the inlet-pipe 16. The air from theclinker-pit enters the hood-chamber 4' in aheated condition, but istherein superheated by the intense heat from the interior of the kiln,whichheats the interior face of the hood, and hence the air in chamber4. The finelypulverized fuel entering the pipe 16 is sucked. withthehighly-heated air into the blower. Here being agitated by the rotaryblower each particle of fuel is brought intocontact with theair, and athorough mixture of the air and fuel results of comparativelyhightemperature, which temperature may be caused to approach theignition-point of the mixture as nearly as safety will permit; also, anyparticles of the fuel that may not have been pulverized finely enoughwill be disintegrated by the action within the blower of therapidly-rotating blades thereof. This tho'r ough mixture of thehighly-heated air and pu verized fuel is ejected from the blower by wayof the exit-pipe 17 and is injected into the kiln, in which it isignited the usual wellknown way. s

s It has been found in the practical use of the described apparatus thatthere is a very considerable saving in the cost of burning of the cementas compared with the cost of burn ing the same when a current of coldair is used for injecting'the fuel into the kiln, for the reason thatthe high temperature within the latter necessary to properly burn thecement is more easily and economically maintained by the use of myinvention.

By suitably shifting the belt 22 on the conepulleys 23- and 24 thespeedof rotation-of the screw conveyer 21 may be varied, and consequently thequantity of fuel fed to the blower; also, by means of tlfevariable-speed regulator A the quantity of hot air drawn into the blowerand forced into the kiln may be varied as'desired. Thus the relativequan- I tities in the current of fuel and air caused to enter the kilnmay be adjusted as circumstances shall require, and by suitableadjustments of speed the quantity of air mixed with the fuel within theblower may bemade to approximate the entire amount necessary to supportcombustion within the kiln, if desired.

the clinker pit, the hood having the cham-.

ber communicatin with said clinker-pit, the blower, the pipe ea'dingfiom said hood- .c amber into said blower, the-exit-pi e leading fromthe blower throu h said hood into the kiln, and means for su p ying acontinuous uniform quantity of pu verized fuel into said blower,substantially as set forth.

2. Thecombinatmn with the rotary kiln, the clinker-pit, the hood havingthe chamber communicating with said clinker it, the blower, the pipeleading from said hoo -chamher into said blower, the exit-pipe leadingfrom the blower thro'ugh said hood into the kiln, and means for suplying a continuous, uniform quantity of pu verized fuel into saidfirst-mentioned pipe, substantially as set forth.

3. The combination withzthe rotary kiln, of the hood having theair-chamber therein, the blower, the pipe leading from said hoodchamberinto said blower, the exit )ipe leading from the blower through said oodinto the kiln, and means for supplying a uniform, continuous quantity ofpulverized fuel into said blower, substantially as set forth.

4. The combination with the rotar kiln, of-the hood having theair-chamber t ierein, the blower; the pipe leading from said hoodchamberinto said blower, the exit- )ipe leading from the blower through said-liood into the kiln, the pipe communicating with said blower and with asource of fuel-supply, the rotary screw conveyer within thelast-mentioned pipe, together with means for regulating the speed ofsaid screw conveyor, and means for regulating the speed of said blower,substantially as set forth.

5; The combinationwith the rotary kiln, of the hood having theair-chamber therein, the blower, the pipe leading from said hoodchamberinto said blower, the exitipe leading from said blower through said ioodinto the kiln, means for supplying a uniform con- HARRY HITZEL.

Witnesses:

ARNOLD FREDERICK GERSTEN, ARNOLD FREDERICK SINCLAIR.v

